Brent Crude
Sweet (low sulphur) and light (easy to refine into gasoline) oil benchmark based on oil originally extracted from the Brent fields in the North Sea. Oils delivered overwater via tanker are often classified as Brent Crude.
West Texas Intermediary (WTI)
Slightly lighter and sweeter than Brent, WTI is a higher quality oil produced in North America. However, due to being produced on land, it is used to benchmark oils which require more expensive, land-based transport.